Hi,
arava wrote:
> I have a some Questions . Could somebody kiindly clarify?
>
> To begin with let me define the terms used in the questions.
>
> A} Supporting class --- A Utility class in the same package as the BEAN
> class
>
> B} "class in the system"--A Utility class in the same package as the
> BEAN class and the supporting class
difficult to distinguish between A and B.
>
> The Questions are:
>
> 1} Can you call a static method of a supporting class from your Bean
> class ?
Bean restrictions apply to the bean class and all supporting classes
shipped with the bean. Using static methods prevents your bean for
keeping the same semantic over VM boundaries. But it also helps
achieving some behaviors, that would be else to expensive to get. Do it
if you don't intend to scale your Bean over WMs.
>
> 2} can your supporting class call a static method another class in the
> System??
idem.
>
> 3} Should the methods of the supporting class be PUBLIC ONLY or can
> they have PACKAGE visibility??
package visibility is allowed. except explicitely cited restrictions,
EJB changes nothing on the Java programming language.
>
> 4} can your bean access a synchronized method of a supporting class?
No. I'm aigains using thread synchronization primitives (and even going
arround this restgriction), since it will often coflicts with the
server's thread management.
>
> 5} Can a supporting class access a synchronized method of another class
> in the system??
No. Restrictions apply to beans and the transitive closure of all non
system classes they access. System classes defined here as classses that
are not packaged with the bean and that are written with respect to the
server implementation (i.e. same thread management concept).
/Francis
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